Question

Упростите выражение 4x(x+y)-(x-y)(2x-y)

Answer 1

= 4x²+4xy-2x²+xy+2xy-y²=2x²+7xy-y²

Answer 2

4x(x+y)-(x-y)(2x-y)=4x²+4xy-2x²+2xy+xy-y²=2x²+7xy-y²=2(x+7/2y)²-53/4y²